How to set it up, use it every night, and keep it clean — in plain English.
This guide is for the Maisiwei M04.
It pushes a gentle, steady stream of air through a mask while you sleep — so your breathing stays open and you rest better. Everything you need is in here, step by step.
What's inside
Tap any line on screen to jump there. If you printed this, the numbers below match the section headings.
When you have sleep apnea, your throat can relax and close while you sleep, so you stop breathing for short moments — over and over, all night. This machine quietly prevents that.
It blows a soft, steady stream of air through a tube and a face mask. That gentle air pressure acts like a cushion that holds your airway open, so you keep breathing smoothly and sleep through the night. A small water tank warms and moistens the air so your nose and throat don't dry out.
Good for
Adults with sleep apnea, heavy snoring, or trouble getting enough air at night.
Where to use it
At home in bed, or in hospital. Always set up by, or on the advice of, a doctor.
Your model
Maisiwei M04 — the full version. It can run simple or advanced breathing modes (see Section 9).
!Please remember
This is a comfort and treatment machine, not a life-support machine. If the power goes out while you are not using it, nothing dangerous happens — it simply stops. Use it under your doctor's guidance.
02
Part 1 · The basics
Get to know your machine
Front
1
Screen — shows the pressure, mode, and your settings.
2
Round knob — turn it to move around, press it to choose. This is your main control.
3
Start / Stop button — press to begin treatment, press again to stop.
Around the back and sides
Power socket
On the back. The power adapter plugs in here.
Air outlet
The round port where the breathing tube connects.
Air filter
A small foam pad in a slot. It keeps dust out (replace weekly).
SD card slot
On the side. Records your sleep data — leave the card in.
Water tank
The clear humidifier that slides into the front of the machine.
What came in the box
Machine with water tank — ×1
Power adapter & cord — ×1
Spare air filters — ×2
SD card — ×1
Carry bag — ×1
Manual & certificate
The mask and breathing tube may come separately. Any standard mask with a 22 mm round connector will fit.
03
Part 1 · The basics
The screen and the two controls
There are only two things to touch: the round knob and the Start/Stop button. Master these and you can do everything.
Turn the knob
to move the highlight from one thing to the next, or to change a number up and down.
Press the knob
to choose what's highlighted, and to save a number after you change it.
The home screen
This is what you see when the machine is on but not yet running. The six boxes are everything you can open.
STANDBY21:40
PREHEAT
00:00
HUMIDITY
0
RAMP
00
Settings
Info
Alerts
Preheat — warms the water before bed.
Humidity — how moist the air is (0–6).
Ramp — starts soft, builds up slowly.
Settings — language, brightness, units.
Info — your sleep numbers.
Alerts — warning beeps (doctor sets these).
The one rule that covers every setting: turn the knob to land on something → press to open it → turn to change → press again to save. When something is ready to change, its text turns orange.
04
Part 2 · Every day
Setting it up the first time
Do this once, on a flat, steady table near your bed and near a power socket — away from water and out of direct sun. After the first time, you only need to top up the water (Section 5).
1
Slide the water tank out. Make sure the machine is unplugged first.
2
Open the lid and fill with distilled water. Stay between the MIN and MAX lines. Never fill past MAX. Close the lid. (Full details in Section 5.)
3
Slide the tank back into the machine until it clicks into place.
4
Connect the tube. Push one end onto the round air outlet, and the other end onto your mask.
5
Plug in the power. Adapter into the socket on the back, then into the wall.
6
The screen lights up. You're ready. Put the mask on and you can start (Section 6).
✓Tip
Leave it set up and plugged in by the bed. Each night you just put the mask on and press Start.
05
Part 2 · Every day
Adding water
The water tank moistens the air so your nose and throat stay comfortable. Check it before bed and top it up when it's low.
Keep the water between the two lines
Above MIN so it doesn't run dry, below MAX so it can't spill into the machine.
Use distilled water only
No tap water or mineral water — they leave deposits. No distilled water on hand? Boil water, then let it cool to room temperature first.
How to refill
1
Unplug the machine and slide the water tank out.
2
Open the lid, pour distilled water up to (not over) the MAX line, and close the lid.
3
Slide it back in. It's good to change the water every day so it stays fresh.
!Important
Never tip or turn the machine upside down while there's water in the tank — water can get inside and damage it. Always empty the tank before moving or storing the machine.
06
Part 2 · Every day
Using it each night
1
Put the mask on
Comfortable and snug, no big gaps.
2
Press Start
The Start/Stop button. Air begins to flow.
3
Sleep
Breathe normally. The machine does the rest.
4
Press Start again
In the morning, to stop.
What the screen shows while it's running
CPAP · NOW
6.0
cmH₂O
Set pressure 4.0
Leak 2.4
Minute air 22.4
Time 0:00
The big number is the pressure right now. You don't need to do anything with these — they're just for you and your doctor to glance at.
Don't like the cold blast at the start? Turn on Ramp so it begins soft and builds up slowly, and turn on Preheat so the water is already warm. Both are in the next section.
07
Part 2 · Every day
Comfort settings
These three live right on the home screen and are safe to adjust yourself. For each one: turn the knob to land on it, press, turn to change, press to save.
0–6
Humidity
How moist the air feels. 0 is off, 6 is the most moisture. If your nose feels dry, turn it up; if you notice drops of water in the tube or mask, turn it down. A setting of 3–4 suits most people.
0–60
min
Ramp (gentle start)
Starts at a low, easy pressure and slowly climbs to your full pressure over the time you set — so it's comfortable while you fall asleep. Set the number of minutes (steps of 5, up to 60). Set it to 0 to turn ramp off.
On/Off
Preheat
Warms the water before you start, so the very first breaths aren't cold. Turn it on a few minutes before bed.
!Before turning humidity on
Make sure the water tank is properly clicked in and filled with distilled water.
08
Part 2 · Every day
Other settings & the info screen
Settings menu
From the home screen, land on Settings and press. These are all safe to change.
Language
Chinese or English. Restart the machine to apply.
Brightness
Dim the screen for the bedroom (10–100).
Pressure unit
cmH₂O or hPa. Leave as your doctor set it.
Auto-start
When on, it starts when you breathe in, and stops about a minute after you take the mask off.
Restore defaults
Resets to factory settings. Avoid unless told to.
Info screen — your sleep numbers
Land on Info and press to see how things are going. You can't break anything here — it's just for looking.
AHI
How many times per hour your breathing paused. Lower is better — your doctor will tell you a good target.
Total therapy time
All the hours you've used it so far.
Last session
How long you used it last night.
Average leak
How much air escaped around the mask. If it's high, the mask needs adjusting.
Version & serial
The machine's ID numbers — handy if you call support.
The machine quietly saves this to the SD card. If your doctor asks for your data, just bring the card or the machine.
09
Part 3 · Doctor settings
Pressure & breathing modes
!Leave this to your doctor
The pressure and mode decide how the therapy works for your body. Your doctor has already set them for you. This section explains what they mean and how the menu works — so you understand your machine — but don't change these on your own.
How the doctor opens these settings
From the home screen, press and hold the Start button and the knob at the same time. This opens the hidden Doctor menu. It's tucked away on purpose, so it can't be changed by accident.
DOCTOR MENU
ModeCPAP
Initial pressure5.0
Therapy pressure6.0 ◂
Breathing rate10
Rise time2
When a line turns orange, it's ready to change. Turn the knob to set the value, press to save.
The breathing modes (your M04 has all of them)
CPAP
One steady pressure all night. The simplest mode.
Auto
The machine raises or lowers the pressure by itself, as your breathing needs.
S
Two pressures — a stronger one as you breathe in, gentler as you breathe out. You trigger each one.
T
The machine sets the breathing rhythm on a timer.
ST
Follows your own breathing, but steps in with a backup rhythm if you pause.
M04 ranges — for your doctor's reference
Setting
Range
Step
Therapy pressure
4–25 cmH₂O
0.5
Breathe-in pressure (IPAP)
4–23 cmH₂O
0.5
Breathe-out pressure (EPAP)
6–25 cmH₂O
0.5
Breathing rate
3–30 / min
1
Trigger sensitivity (in & out)
1–5
1
Rise time
1–3
1
Breathe-in time
0.3–2.5 s
0.1
Built-in rules: the breathe-out pressure can't be set higher than the breathe-in pressure, and the starting pressure can't be higher than the therapy pressure.
10
Part 4 · Care & problems
Cleaning every week
1×
Clean it at least once a week. Always switch off and unplug first. Let the water cool before you touch the tank.
Part
How to clean it
Machine body
Wipe with a soft cloth, lightly damp with water or mild soap. Never soak it or run it under a tap. Dry before use.
Water tank
Empty leftover water, soak in mild soapy water, rinse with water no hotter than 41°C (warm, not hot), then air-dry.
Tube
Rinse the inside with mild soapy water, then clean water. Hang to dry away from direct sunlight (sun can warp it).
Mask
Follow the mask's own instructions. Wipe the parts that touch your face.
!Don't
No bleach and no strong alcohol (over 75%). Don't soak the machine body. Make sure every part is fully dry before putting it back together.
11
Part 4 · Care & problems
Replacing the filter
The air filter is a small foam pad that keeps dust out of the machine. Check it weekly and swap in a fresh one — you got spares in the box, and they're cheap to buy more.
1
Open the filter cover on the machine.
2
Take out the old foam pad and put in a new one.
3
Close the cover. Make sure the pad sits flat and snug.
✓When to replace
About once a week — or sooner if it looks grey, dusty, or torn. A clogged filter makes the machine work harder.
12
Part 4 · Care & problems
When something's wrong
Everyday problems
What you notice
What to try
Air leaks around the mask
Re-fit the mask snugly. If it still leaks, the size or type may be wrong.
Dry or blocked nose
Turn the humidity up a notch.
Water drops in the tube/mask
Turn the humidity down a notch.
Feels too weak at first
That's the Ramp working. Wait for it to build up, or set Ramp to 0.
Black screen
Check the power. Re-seat the adapter and wall plug.
No mist from the tank
Check it's clicked in and has water. Turn humidity up.
Little or no airflow
Check the tube is connected and not pinched; check the filter isn't clogged.
Messages on the screen
If the machine shows one of these and beeps, here's what it means. If a restart and the simple check don't fix it, call the supplier — never open the machine yourself.
Message
What to do
System leak
Big air leak. Check the tube and mask are connected tightly.
Tube blockage
Something is blocking the air. Check the tube isn't pinched or kinked.
Tube disconnected
The tube came off. Push it firmly back on.
Pressure too high / low
Check connections and restart. If it stays, call the supplier.
Power fault
Check the adapter and cable. Re-seat both plugs.
Motor abnormal
Restart. If it returns, stop using it and call the supplier.
13
Part 5 · Safety & reference
Important safety rules
Do
Keep it on a flat, steady surface away from water.
Use only the supplied adapter, tube, and accessories.
Keep the tube and cord unkinked and uncovered.
Use distilled water only in the tank.
Keep the back vents clear so it can cool.
Don't
Don't use near fire, smoking, or extra oxygen (fire risk).
Don't open or repair the machine yourself.
Don't let water get inside it; don't tip it with water in.
Don't use it if the room is hotter than 40°C.
Don't wrap the tube or cord around your neck.
Keep away from
MRI, CT scanners, and strong radio signals. Keep mobile phones a little away from it.
If using extra oxygen
Turn the machine on first, and keep the oxygen source at least 1 metre away.
Power
Works on normal household power (100–240V). Don't lay the cord on anything hot.
!If anything seems off
Strange noises, a cracked case, or air leaking from the machine itself — stop using it and contact support.
14
Part 5 · Safety & reference
Who should not use it
Your doctor has already checked that this machine is right for you. This page is here for your awareness — if any of these change, talk to your doctor before using it.
Must not use it
A collapsed or air-leaking lung
Air trapped in the chest or skull
Recent head injury
Shock or very low blood pressure
An active nosebleed
Uncontrolled stomach bleeding
Large lung blisters (bullae)
No natural breathing at all
Use only with a doctor's go-ahead
Serious heart disease or irregular heartbeat
Acute middle-ear infection
Very weak natural breathing
A lot of mucus with a weak cough
Recent ear, nose, or face surgery
Severe blocked nose
Fear of enclosed spaces / the mask
Mild side effects some people notice
A dry mouth, nose, or throat; a little bloating; mild ear or nose discomfort; or skin marks from the mask. These usually settle — adjusting humidity and mask fit helps.
!Call your doctor if
You get chest pain, a severe headache, or your breathing gets harder. If you have a cold or chest infection, stop using it until you're better.
15
Part 5 · Safety & reference
Quick reference card
The short version — handy to keep by the bed.
Every night
1. Check the water. 2. Put the mask on. 3. Press Start. 4. Press Start again in the morning.
The golden rules
Distilled water only · Clean weekly · New filter weekly · Empty the tank before moving it.
Using any menu
Turn the knob to move · Press to choose · Turn to change · Press to save.
Machine facts (M04)
Pressure range
4–25 cmH₂O
Modes
CPAP · Auto · S · T · ST
Humidity levels
0 to 6
Ramp
0 to 60 minutes
Water tank
About 235 mL · distilled water
Power
100–240V · 50/60Hz
Size & weight
242 × 135 × 130 mm · about 1.4 kg
Room conditions
+5°C to +40°C
16
Part 5 · Safety & reference
Warranty & who to call
How long each part is covered
2 yr
Machine
1 yr
Adapter & cord
90 days
Water tank
Covers the original buyer only. It does not cover damage from misuse, accidents, water getting inside, or repairs by anyone other than the maker. Keep your receipt.